#include<bits/stdc++.h>
using namespace std;
int main()
{
double a,b,c,d,r;
cin >>a;
r = 3.14159;
c = a*2;
d = a*2*r;
b = a*a*r;
cout <<fixed<<setprecision(4) <<c <<" " ;
cout<<fixed<<setprecision(4) <<d <<" ";
cout<<fixed<<setprecision(4) <<b;
return 0;
}